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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
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A Novel Motion Platform Based on Dual Driving Feet Linear Ultrasonic Motor.

Yue Jian1, Zhen Liu2, Ping Yao1

  • 1School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China.

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A novel motion platform using a π-shaped linear ultrasonic motor offers enhanced stability and accuracy. This design achieves a 40% smaller volume and 150% stroke length, reaching speeds over 200 mm/s with 1.1 μm positioning accuracy.

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Area of Science:

  • Mechanical Engineering
  • Robotics
  • Mechatronics

Background:

  • High-power linear ultrasonic motors require stable preload mechanisms.
  • Conventional motion platforms face limitations in size and stroke length.

Purpose of the Study:

  • To develop a novel, compact, and high-performance motion platform.
  • To improve operational stability, positioning accuracy, and stroke length.

Main Methods:

  • Designed and validated a new preload device for linear ultrasonic motors.
  • Developed a novel mover using a ceramic-ceramic mechanism, replacing linear guides.
  • Fabricated and experimentally evaluated a prototype platform.

Main Results:

  • The new preload device ensures stable operation and enhances positioning accuracy.
  • The ceramic-mover design reduces volume by 40% and increases stroke to 150%.
  • Prototype achieved velocities over 200 mm/s and positioning accuracy of 1.1 μm.

Conclusions:

  • The developed motion platform offers significant improvements in performance and form factor.
  • The novel preload device and ceramic mover are key innovations.
  • This technology is suitable for applications demanding high speed and precision.